Classifications

• • A—HUMAN NECESSITIES
  • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
  • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
  • A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
  • A01G24/40—Growth substrates; Culture media; Apparatus or methods therefor characterised by their structure
  • A01G24/48—Growth substrates; Culture media; Apparatus or methods therefor characterised by their structure containing foam or presenting a foam structure
• • A—HUMAN NECESSITIES
  • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
  • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
  • A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
  • A01G24/10—Growth substrates; Culture media; Apparatus or methods therefor based on or containing inorganic material
  • A01G24/12—Growth substrates; Culture media; Apparatus or methods therefor based on or containing inorganic material containing soil minerals
  • A01G24/13—Zeolites
• • A—HUMAN NECESSITIES
  • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
  • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
  • A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
  • A01G24/20—Growth substrates; Culture media; Apparatus or methods therefor based on or containing natural organic material
  • A01G24/22—Growth substrates; Culture media; Apparatus or methods therefor based on or containing natural organic material containing plant material
  • A01G24/25—Dry fruit hulls or husks, e.g. chaff or coir
• • A—HUMAN NECESSITIES
  • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
  • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
  • A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
  • A01G24/20—Growth substrates; Culture media; Apparatus or methods therefor based on or containing natural organic material
  • A01G24/28—Growth substrates; Culture media; Apparatus or methods therefor based on or containing natural organic material containing peat, moss or sphagnum
• • A—HUMAN NECESSITIES
  • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
  • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
  • A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
  • A01G24/30—Growth substrates; Culture media; Apparatus or methods therefor based on or containing synthetic organic compounds

Definitions

• the invention relates to growth substrates.
• the growth substrate comprises a wetting agent which provides water handling characteristics.
• the invention also relates to methods of growing plants using the growth substrate and to the use of specific types of wetting agent to provide particular characteristics to a growth substrate.
• US4174957 and US4240817 Two examples of this are US4174957 and US4240817 . Each of these describes application of a wetting agent to urea formaldehyde foam.
• the wetting agent is "alcohol or various phosphates such as those used in detergents" and Surfside 30 is given as an example.
• US 4240817 describes the use of alkylene glycol (a non-ionic material).
• one problem which tends to arise with the non-ionic surfactants which have conventionally been used is that they are, during irrigation of the growth substrate, gradually lost from the growth substrate rather than being retained in the growth substrate structure. This means that the wettability properties of the growth substrate gradually decrease over time. This can have an impact on, for instance, the re-saturation properties and also on the water handling properties of a substrate which has been in place for a considerable time, and thus on the performance of the plant and growing process.
• EP-A-1226749 discloses a process for the production of water-absorbing fibre products, which can be used for growing plants. According to this process, during production of the fibres, material is applied to the fibres after formation and before collection, comprising binder, wetting agent and aliphatic polyol.
• the binder can be a conventional phenol-based resin.
• the polyol can preferably be ethylene glycol, propylene glycol or trimethylolpropane.
• the wetting agent can be selected from a long list including salts of higher fatty acids, alkyl or aralkyl sulphates or sulphonates, fatty alcohol sulphates, alkyl phosphates, fatty alcohol ethoxylates, alkyl phenol ethoxylates, fatty amine ethoxylates, fatty acid ethoxylates, alkyl ammonium compounds.
• Alkyl benzene sulphonate is said to be preferred. No reason is given for this preference in the context of the fibre products disclosed.
• a method of growing plants in a synthetic growth substrate comprising:
• the growth substrate itself is novel and so in a second aspect we provide a non-fibrous growth substrate comprising wetting agent, wherein the wetting agent comprises ionic surfactant.
• ionic especially anionic surfactant, especially linear alkyl benzene sulphonate (LAS)
• LAS also has the advantage of being aerobically biodegradable in water. Phytotoxicity is low.
• ionic surfactant to improve the water distribution characteristics of a non-fibrous growth substrate. Improvement is shown in particular in comparison with growth substrates containing a conventional wetting agent such as a non-ionic surfactant. The improvement can be shown either by replacement of a conventional non-ionic wetting agent or by addition of the ionic surfactant to the growth substrate, but generally is shown by replacement of the conventional wetting agent.
• the growth substrate is non-fibrous. It is usually either formed of foam or is particulate.
• polymeric foam is generally an organic polymeric foam.
• polymeric foam materials are urea formaldehyde foam (sold as Oasis and Phytocell), and Styrofoam, and polyurethane foam.
• inorganic particulate materials are perlite, vermiculite, lava granules, expanded clay granules, pumice.
• Organic particulate materials include coco chips, coco dust, peat.
• foam or particulate is used, but blends can be used, in particular if the foam is granulated before blending. Blends of different particulates can also be used.
• Fibrous materials include mineral wool (although this is less preferred), wood fibres, coco fibres.
• the growth substrate is normally a soil substitute, so generally is a non-soil material. Soil and peat may be included in small amounts, eg below 20%, in particular below 10% (by weight of the growth substrate).
• Density of the growth substrate in the consolidated form depends on the particular material used.
• Foam products preferably have density from 20 to 125 kg/m3.
• Clay products preferably have density for 300 to 700 kg/m3.
• Coco products preferably have density from 55 to 125 kg/m3.
• Lava products preferably have density from 50 to 300 kg/m3.
• Perlite products preferably have density from 40 to 175 kg/m3.
• Pumice products preferably have density from 300 to 500 kg/m3.
• Vermiculite products preferably have density from 30 to 100 kg/m3.
• Peat products preferably have density from 40 to 300 kg/m3.
• the density of the product can range from 10 to 600 kg/m3, preferably 30 to 200 kg/m3, preferably 30 to 100 kg/m3.
• the growth substrate when it comprises foam, it can also comprise a binder if required to proved physical integrity. If used, it is usually an organic binder, which is generally heat-curable. In such a case the growth substrate is preferably a coherent matrix connected by cured binder.
• the invention is particularly valuable when the binder is an organic hydrophobic binder, and in particular when it is a conventional heat-curable (thermosetting), hydrophobic binder. This has the advantage of convenience and economy.
• the binder is preferably a phenol formaldehyde resin or urea formaldehyde resin, in particular phenol urea formaldehyde (PUF) resin.
• the binder is generally present in the growth substrate in amounts of from 0.1 to 10% based on the substrate, usually 0.5 to 5%, most preferably 1.5 to 5%.
• the growth substrate comprises a wetting agent which is an ionic surfactant.
• anionic surfactant Preferably it is an anionic surfactant.
• Suitable anionic surfactants include salts (including, for example, sodium, potassium, ammonium and substituted ammonium salts such as mono-,di-and triethanolamine salts) of the anionic sulphate, sulphonate, carboxylate and sarcosinate surfactants.
• Other anionic surfactants include isethionates such as the acyl isethionates, N-acyl taurates, fatty acid amines of methyl tauride, alkyl succinates and sulfosuccinates, mono esters of sulfosuccinates, di-esters of sulfosuccinates and N-acyl sarcosinates.
• anionic sulphate surfactants and anionic sulphonate surfactants anionic carboxylate surfactants and anionic soap surfactants.
• anionic sulphonate surfactants such as linear and branched alkyl benzene sulphonates, alkyl ester sulphonates, primary or secondary alkyene sulphonates, olefin sulphonates, sulphonated polycarboxylic acids, alkyl glycerol sulphonates, fatty acyl glycerol sulphonates, fatty oleyl glycerol sulphonates and mixtures thereof.
• the anionic surfactant is a linear alkyl benzene sulphonate in which the alkyl chain has from 5 to 20 carbon atoms.
• the sodium salt is preferred.
• This type of surfactant provides particularly beneficial water distribution properties and also provides excellent re-saturation properties and does not lead to foaming problems in the irrigation water.
• Conventional non-ionic surfactants allow the growth substrate to take up water but its water retaining capacity is not as good as with the type of surfactant used in the invention.
• the alkyl chain length is in the range 8 to 16, and more preferably at least 90% of the chains are in the range 10 to 13 and more preferably at least 90% (by weight) are in the range 10 to 12.
• the ionic surfactant may be cationic or zwitterionic.
• cationic surfactants include quaternary ammonium surfactants. These can, for instance, be selected from mono C6 to mono C16, preferably C6 to C10 N-alkyl or alkenyl ammonium surfactants wherein the remaining N positions are substituted by groups such as methyl, hydroxyethyl and hydroxypropyl.
• Suitable zwitterionic surfactants include derivatives of secondary and tertiary amines, derivatives of heterocyclic secondary and tertiary amines, or derivatives of quaternary ammonium, quaternary phosphonium or tertiary sulphonium compounds. Betaine and sultaine surfactants are examples of zwitterionic surfactants.
• the ionic surfactant is present in the growth substrate in amounts preferably from 0.03 to 5% (by weight), based on growth substrate, more preferably 0.01 to 3%, in particular, 0.15 to 2%.
• the amount (by weight) of ionic surfactant based on the weight of binder (dry matter) is in the range 0.01 to 5%, preferably 0.5 to 4%.
• levels of such other materials are preferably below 0.1 % (by weight) in particular below 0.01%, based on the growth substrate.
• the growth substrate comprises foam
• it may contain other types of conventional additives in addition to binder and wetting agent, for instance salts such as ammonium sulphate and adhesion promoters such as silanes.
• plants are positioned in the synthetic growth substrate for growth.
• One plant, or more than one, may be positioned in a single block of growth substrate.
• the method may be any method of growing plants in a mineral wool substrate. These applications include germination of seedlings, propagation of cuttings, growth of plants in containers, freely planted cultures and sucking beds.
• the growth substrate can be provided in the form of a coherent mass.
• the growth substrate may be in any integral form, for instance in the form of small blocks or plugs, larger blocks, or an extensive mat/slab. Other dimensions may be selected as convenient.
• the growth substrate can thus be a coherent matrix , which has been produced as such, but can be formed by granulating a slab of growth substrate material and consolidating the granulated material. Alternatively, it may be used as a flowable particulate or granular composition, which is given shape by being held in a container. Which form is used will depend on the type of material used for the growth substrate.
• the mass of growth substrate may have a variety of height, width and length dimensions, as conventional.
• the plants are irrigated with water and nutrients, as is conventional.
• ionic surfactant has the advantage that loss of the wetting agent to the irrigation water is minimal, allowing for a system in which there is essentially no anti foam material in the irrigation water.
• the growth substrate exhibits a particularly desirable distribution of water over height.
• This distribution can be determined by comparing the water content at the top of the substrate with the water content at the bottom of the substrate.
• Each of these values are usually expressed as percentages and the difference between them is preferably less than 40%, more preferably less than 35% and in particular less than 30%. This may even be a negative value, when the water content is greater at the top than at the bottom. It may be up to -10%.
• the beneficial properties of the ionic surfactant allow the use of the growth substrate of the invention in specific ways to obtain particular advantages not achievable with conventional non-fibrous growth substrates.
• this particular ionic surfactant especially linear alkyl benzene sulphonate surfactant, provides a surprisingly effective combination of water handling properties.
• Water distribution properties are especially important when a growth substrate having relatively large height is used, because it is such materials which suffer most from problems of water concentrating in the lower regions of the substrate.
• ionic surfactant especially anionic surfactant, in particular linear alkyl benzene sulphonate surfactant (LAS)
• LAS linear alkyl benzene sulphonate surfactant
• inclusion in the growth substrate of ionic surfactant as the wetting agent contributes towards the ability of the substrate to result in homogeneity of water properties (including water retention, resaturation and hydraulic conductivity) within a single mass of growth substrate, between masses of growth substrate produced in a single batch, and between batches of growth substrate. Accordingly, growers can confidently apply plants to potentially huge areas of the same growth substrate and maintain, over that entire area, a very narrow range of water contents, using the same irrigation system, so that as many plants as possible are maintained at optimum water content and there is minimal wastage of irrigation water and additives.
• resaturation properties mean that this growth substrate is especially beneficial in processes where the substrate must be dried out and rewetted.

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• Life Sciences & Earth Sciences (AREA)
• Environmental Sciences (AREA)
• Soil Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Inorganic Chemistry (AREA)
• Cultivation Of Plants (AREA)
• Hydroponics (AREA)
• Agricultural Chemicals And Associated Chemicals (AREA)

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Citations (6)

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• 2006
  • 2006-07-20 EP EP06253804A patent/EP1880601A1/en not_active Ceased
• 2007
  • 2007-07-20 US US12/374,330 patent/US8205380B2/en not_active Expired - Fee Related
  • 2007-07-20 CA CA2658386A patent/CA2658386C/en not_active Expired - Fee Related
  • 2007-07-20 EP EP07786224.1A patent/EP2048937B1/en not_active Not-in-force
  • 2007-07-20 PL PL07786224T patent/PL2048937T3/pl unknown
  • 2007-07-20 SI SI200732033T patent/SI2048937T1/en unknown
  • 2007-07-20 MX MX2009000639A patent/MX2009000639A/es not_active Application Discontinuation
  • 2007-07-20 WO PCT/EP2007/006475 patent/WO2008009463A1/en active Application Filing
  • 2007-07-20 EA EA200970137A patent/EA014993B1/ru not_active IP Right Cessation

Patent Citations (6)

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